n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 2 |
4 | 5 |
5 | 15 |
6 | 42 |
7 | 132 |
8 | 431 |
9 | 1430 |
10 | 4862 |
11 | 16801 |
12 | 58786 |
13 | 208012 |
14 | 742914 |
15 | 2674440 |
16 | 9694845 |
17 | 35357712 |
18 | 129644790 |
19 | 477638700 |
20 | 1767263322 |
21 | 6564120420 |
22 | 24466267020 |
23 | 91482564069 |
24 | 343059613650 |
25 | 1289904147324 |
26 | 4861946402882 |
27 | 18367353072152 |
[1,1,2,2,5,15,42,132,431,1430,4862,16801,58786, 208012,742914,2674440,9694845,35357712,129644790, 477638700,1767263322,6564120420,24466267020, 91482564069,343059613650,1289904147324, 4861946402882,18367353072152] |